About tuned liquid multi-column damper

[sleepy-Tehal]

Dear @jjonkman ,

I want to use a tuned liquid multi-column damper for vibration suppression control in semi-submersible platforms.

Can this be implemented in OpenFAST?

Best regards,

[jjonkman]

Dear @sleepy-Tehal,

The Structural Control (StC) submodel of ServoDyn supports placing tuned liquid column dampers (TLCDs) in the blades, nacelle, tower, and substructure.

My only concern with the figure you show of your TLCD is that the horizontal channel has a split Y configuration with three vertical columns. The TLCD model in StC supports TLCDs with two vertical columns and one horizontal channel and independent TLCDs in each horizontal direction. Perhaps you can approximate your system with the existing TLCD model or perhaps you'd want to update the TLCD model (by changing the source code) to better tailor it to your design.

For more information on the TLCD model of StC, see the StC documentation on readthedocs: https://openfast.readthedocs.io/en/main/source/user/servodyn-stc/StC_index.html

Best regards,

[sleepy-Tehal]

Dear @jjonkman

Can TLMCD be accessed using an external control interface? Such as external dynamic link library or simulink.

Best regards，

[jjonkman]

Dear @sleepy-Tehal,

While StC supports active control of TMDs and forces through the DISCON dynamic library interface, there is no interface to control TLCDs through this interface. And StC does not currently support an interface to MATLAB / Simulink. Supporting such features would require a source code change.

Best regards,